racket: aufgraeumt, data2c gefixt

1 files changed, 0 insertions, 158 deletions

diff --git a/ebus-racket/layer7.rkt b/ebus-racket/layer7.rkt
deleted file mode 100644
index b335ddc..0000000
--- a/ebus-racket/layer7.rkt
+++ /dev/null
@@ -1,158 +0,0 @@
-#lang racket/base
-(require racket/list
-         (planet lizorkin/sxml:2:1/sxml)
-         (planet lizorkin/ssax:2:0/ssax)
-         "layer2.rkt")
-
-(define logger (make-logger 'ebus-layer7 (current-logger)))
-
-(define definition
-  (ssax:xml->sxml (open-input-file "../ebus-xml/ebus.xml")
-                  '[(#f . "http://xapek.org/ebus/0.1")]))
-
-(define (paket ebus-paket)
-  (define primaryCommand (layer2-ebus-paket-primaryCommand ebus-paket))
-  (define secondaryCommand (layer2-ebus-paket-secondaryCommand ebus-paket))
-  ((sxpath (string-append "//packet[@primary=" (number->string primaryCommand)
-			  " and @secondary=" (number->string secondaryCommand) "]"))
-   definition))
-
-;; returns the full device-definition
-(define (device address)
-  ((sxpath (string-append "//devices/device[@address=" (number->string address) "]"))
-   definition))
-
-;; returns device-name in a list or empty-list
-(define (device-name address)
-  (first ((sxpath "@name/text()") (device address))))
-
-
-(define (paket-fields ebus-paket)
-  (define paket-definition (paket ebus-paket))
-  (cond ((> (length paket-definition) 0)
-	 (let* 
-	     ([paket-name (string-append 
-			   (device-name (layer2-ebus-paket-source ebus-paket))
-			   "." 
-			   (first ((sxpath "@name/text()") paket-definition)))]
-	      [fields ((sxpath "fields/*") paket-definition)]
-	      [values 
-	       (for/list ([field fields]) (paket-fields-dispatch-decoder ebus-paket field paket-name))])
-	   ;; filter invalid values
-	   (for/list ([value values] #:when (not (void? value)))
-		     value)))
-	(else (void (log-message logger 'warning (format "Unknown Paket: ~s" ebus-paket) #t)))))
-
-(define (paket-fields-dispatch-decoder ebus-paket field paket-name)
-  (define datatype ((sxpath "name()") field))
-  (define name (string-append paket-name "." (first ((sxpath "@name/text()") field))))
-  (define offset (string->number (first ((sxpath "@offset/text()") field))))
-  (define payload (layer2-ebus-paket-payload ebus-paket))
-  (cond ((string=? "bit" datatype)
-	 (list name datatype offset
-	       (field-decoder-bit (list-ref payload offset))))
-	((string=? "bcd" datatype)
-	 (list name datatype offset
-	       (field-decoder-bcd (list-ref payload offset))))
-	((string=? "data1b" datatype)
-	 (list name datatype offset
-	       (field-decoder-data1b (list-ref payload offset))))
-	((string=? "data1c" datatype)
-	 (list name datatype offset
-	       (field-decoder-data1c (list-ref (layer2-ebus-paket-payload ebus-paket) offset))))
-	((string=? "byte" datatype)
-	 (list name datatype offset (list-ref payload offset)))
-	((string=? "data2b" datatype)
-	 (list name datatype offset
-	       (field-decoder-data2b (list-ref payload offset)
-				     (list-ref payload (+ offset 1)))))
-	((string=? "data2c" datatype)
-	 (list name datatype offset
-	       (field-decoder-data2c (list-ref payload offset)
-				     (list-ref payload (+ offset 1)))))
-	((string=? "word" datatype)
-	 (list name datatype offset
-	       (field-decoder-word (list-ref payload offset)
-				   (list-ref payload (+ offset 1)))))
-	((string=? "byteEnum" datatype)
-	 (list name datatype offset
-	       (field-decoder-byteEnum (list-ref payload offset) field)))
-	(else (void (log-message logger 'error (format "unknown datatype: ~a" datatype) #t)))))
-
-;; type bit
-(define (field-decoder-bit value)
-  (cond ((= value 1) 1)
-        (else 0)))
-
-;; type data1b
-(define (field-decoder-data1b value)
-  value)
-
-;; type data1c
-(define (field-decoder-data1c value)
-  (/ value 2.0))
-
-;; type data2b
-(define (field-decoder-data2b lowByte highByte)
-  (if (= (bitwise-and highByte 128) 128)
-      (* -1 
-	 (+ (+ 256 (bitwise-not highByte))
-	    (/ (+ 256 (bitwise-not (+ lowByte 1))) 256.0)))
-      (+ highByte (/ lowByte 256.0))))
-
-;; type data2c
-(define (field-decoder-data2c lowByte highByte)
-  (define (lowNibble v)
-    (bitwise-and v #x0f))
-  (define (highNibble v)
-    (arithmetic-shift v -4))
-  (define (u-not v)
-    (+ 256 (bitwise-not v)))
-  (if (= (bitwise-and highByte 128) 128)
-      (* -1
-	 (/
-	  (+ (arithmetic-shift (u-not highByte) 4)
-	     (u-not (highNibble lowByte))
-	     (+ (u-not (lowNibble lowByte)) 1))
-	  16.0))
-      (+ (* 16 highByte)
-	 (arithmetic-shift lowByte -4)
-	 (/ (lowNibble lowByte) 16))))
-
-;; type byteEnum
-(define (field-decoder-byteEnum value field-definition)
-  (define (pred l)
-    (= value (list-ref l 0)))
-  (define all-options (for/list ([option ((sxpath "option") field-definition)])
-				(list (string->number (first ((sxpath "@value/text()") option))) ;; value, name
-				      (first ((sxpath "@name/text()") option)))))
-  (define options (filter pred all-options))
-  (cond ((= (length options) 1)
-	 (list-ref (first options) 1))
-	(else "<undefined>")))
-
-;; type word
-(define (field-decoder-word lowByte highByte)
-  (+ lowByte
-     (arithmetic-shift highByte 8)))
-
-;; type bcd
-(define (field-decoder-bcd value)
-  (+ (bitwise-and value #x0f)
-     (arithmetic-shift value -4)))
-  
-;; read one ebus-paket or eof from input-port
-;; or return #<eof>
-(define (read-ebus input-port)
-  (define paket (layer2-read-ebus input-port))
-  (cond ((layer2-ebus-paket? paket)
-	 (paket-fields paket))
-	(else paket)))
-
-(provide (prefix-out layer7- paket)
-         (prefix-out layer7- paket-fields)
-         (prefix-out layer7- device)
-         (prefix-out layer7- device-name)
-	 ;; read ebus from port an return fields from next paket
-	 (prefix-out layer7- read-ebus)
-	 (prefix-out layer7- logger))
\ No newline at end of file